1998-02-03 04:00:00 PDT SAN JOSE -- Police are warning parents in San Jose to keep a watchful eye on their children after a 13-year-old girl walking to her bus stop was kidnapped and sexually assaulted yesterday morning.

Police say this is the sixth in a recent rash of attacks on schoolgirls in the city. Investigators are looking to see if any are connected.

San Jose police are contacting other agencies to check for similar attacks, Carrillo said. In the meantime, they are asking parents to have their children walk to school in groups if they aren't accompanied by a parent.

"One of our options may be to form a task force," Carrillo said. "Or we may possibly increase patrols in our neighborhoods."

In the most recent attack, a girl was grabbed at 6:15 a.m. yesterday at the corner of South 34th and San Antonio streets, Carrillo said. She was shoved into a white four- door car and driven to another area, where she was assaulted, Carrillo said. The man then drove to the 1700 block of Cooley Court, where he dumped the girl.

The 13-year-old went to the door of a nearby house, where the resident called police.

"Officers found the girl wandering around the neighborhood in a state of shock," Carrillo said.

The girl was treated and released from an area hospital and is recuperating at home. Officers declined to describe the nature of the sexual assault.

Police spent much of yesterday canvassing the area of east San Jose, going door to door in hopes of finding clues. The attacker has been described as a man with a dark complexion. Police believe he is 29 or 30 years old, about 5 feet 8 inches tall, and speaks both English and Spanish.

Investigators are trying to determine whether the man involved in yesterday's attack is also connected to the kidnapping and sexual assault of an 8-year-old Carlson Elementary School student in November.

In that instance, the girl was abducted while walking to her school bus stop at 6:45 a.m. Her attacker forced her into a blue late-model car, according to police. An hour later, a motorist spotted the girl about a mile from where she was kidnapped, Carrillo said.

That girl described her attacker as a white man in his early 20s. Officers conducted an intensive search of the area between 33rd Street and Whitton Avenue, where the abduction took place. But no arrests have been made.

Since October, four other girls have been attacked.

On October 24, a 16-year-old fought off a man who tried to assault her while she waited for her school bus near Coleman Road and Winfield Boulevard.

On January 16, a 12-year-old girl was attacked while walking alone to school on a dark path along the Almaden Expressway, south of Ironwood Drive. The man, who was sitting on the trail, grabbed her as she passed and forced her to the ground, where he molested her, according to police.

Police also note that in December, two female students at Piedmont Hills and Independence high schools in December were assaulted on campus. In those cases the teenagers fought off their attackers, police said.

"We have noticed the recent increase in reported incidents," Carrillo said. "And we're looking to see if there is any connection between them, before determining what the next step is."